Sawdust-burning furnace.



J. H. HIRT.

sAwnusT BURNING PURNAGE.

APPLICATION FILED FEB.11, 1913.

Patented Feb. 10, 1914.

INVENTOI? WJ; WAL

HIS ATTORNEY UNITED 'STATES PATENT oFFioE.

JULES :moron Hmm, or EL raso, TEXAS.

SAWDUST-BUBNING FURNACE.

Specification. of Letters Patent.

Patented Feb. 1o, 1914.

Application led February 11, 1913. Serial No. 747,608.

Sawdust in mass frequently contains 50 per cent. or more of water, andbelow the surface of large masses is usuali soaking wet. In thatcondition it is diiiicu t to burn.

The object of this invention is to produce a furnace in which wetsawdust can be rapidly burned.

Referring to the accompanying drawings illustrating the principle ofthis invention in the best mode now known to me of applying thatprinciple, Figure 1 is a top. plan view, and Fig. 2 a central verticalsection at line 2 2 of Fig. 1, of a side-feed forni of my new furnace.Fig. 3 is avertical section at line 3-3 of Fig. 1, and is typical of acorresponding section at line Bfv a of Fig. 4, and Fig. 4 is a verticalsection at line 4 4 of Fig. 3, of a central-feed form of the furnace. O

In the drawings, 1 is a grate, and 2 the ash-pit of a furnace the outerwall 3 of which Y is best made of or lined with fire brick.

4,'4 are two side walls of a central vertical conduit or Hue 5 for thecombustion products. Between outerwalls 3 and inner walls 4,a verticalspace 6, is provided for down- How of sawdust from the hopper-likeextensions 7, one at one side and the other at the other side of thefurnace structure. The upper end of each space 6 communicates by Iapassage Swith a chamber under the usual arch or furnaceehead 9 belowwhich the which is preferably provided with upwardly and outwardlyextending extensions 1a at the foot of each supply-conduit.

As the sawdust-supply-conduit is opened immediately above the grate intothe combustion-products Hue and also communicates at its upper end withthe upper end chamber of the furnace, provision is made for up- How ofsteam through the mass of sawdust as it gravitates to the grate, and thesuction on the exit Hue ofthe furnace causes the steam generated in thehot or burning sawdust mainly to ascend through the mass of sawdust andfinall to pass out of the exit- Hue. Sawdust is indicated by S inone ofthe two sawdust-conduits thus provided.

In the other form of the furnace, illustrated by Figs. 3 and 4, grate 1is provided centrally with an upwardly-extending sawdust-deHector m, theapex of which points toward the open lower end of the central passagewaydown through which the sawdust gravitates to the grate, sawdust beingput into the furnace through the funnel y in arch 9. In this form thecombustion products ascend through the side spaces 6a provided betweenthe outer walls o f the furnace structure and the inner walls` 4, 4.

The invention may be embodied in various other forms.

What I claim is:

A sawdust-burning furnace comprising an a Wall supported at its bottomby an arch above the grate to form an opening between the lower portionsof the conduit and combustion chamber, and also having at its lower enda deHector for directing the downHow- 'ing sawdust on the grate; saidconduit wall rising toward but not contacting with` the leating with theconduit; the conduit having top wall, whereby an opening is formedbetween the upper portions of the conduitl and In testimon whereof IafIix my signature the combustion chamber for outow of in presence o twowitnesses.

steam; anda side Wall ofthe furnace having JULES HECTOR HIRT. an exitopening from the combustion cham- VVt-nesse: 5 ber for out-flow of thesteam and of the com- G. BLAKE,

bustion products. EDWARD E. BLACK'.

